Re: I need a cold sync cable.
You would probably do better finding other ways to save power on your laptop... USB doesn't draw that much power...
Try turning down birghtness, aero when on battery (if on Vista), and a few other sly tricks and you'll probably net the same or more time than you would going to extreme measures to kill power to your phone. Not to mention the phone won't last long with 3G tethering with no backup powering source.
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